My point is that you can't process a raw without some kind WB setting whether it is in the metadata or not. My use of baked in may not have been the best description but the use of WB cannot be avoided?
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To the original question, WB is applied to the image after exposure with the in camera processor to provide the LCD JPEG preview. Since WB is applied after exposure, it should have no impact on the metering of the scene. What it's doing is altering the processed JPEG preview based on the exposure information, not altering the actual exposure.
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You are technically correct but with respect to the final outcome when processing takes place in the ACR or Lightroom then the exposure is affected by you choice of WB setting?